Stoker furnace with inside hopper



Aug, 6, 192 9. G. A. KOHOUT STOKEER FURNACE WITH INSIDE HOPPER z Sheets-Sheet 1 Filed June 15, 1925 WNW Aug. 6, 1929.

G. A. KOHOQT STOKER FURNACE WITH INSIDE HOPPER Filed June 15, 1925 2 Sheets-Sheet 2 Patented Aug. 6, 1929.

\ UNITED STATES GEORGE A. KOKOUT, OF CHICAGO, ILLINOIS.

s'roxaa FURNACE WITH. mama Korma Application fled June 15, 1825. Serial No. 37,188.

My invention relates to furnaces and more particularly to a furnace provided with a opper from which a stoker is adapted to convey fuel into the combustion chamber. It is a purpose of my invention to provide a furnace that is provided with an internal hopper and a combustion chamber and which is provided with meansvfor conveying fuel from the hopper to the combustion chamber under a wall that divides the fur- {)1866 into a hopper and a combustion cham- More particularly it is a purpose of m invention to provide a furnace with an are near one wal thereof so as to provide a hop per between said wall and saidaroh, said furnace bein provided with a stoker, a por tion of whic extends into the hopper and forms the bottom thereof and which furthermore extends under said arch and into a combustion chamber on the opposite side of the arch from said hopper so that the operation of the stoker will carry the fuel from the hopper into the combustion chamber.

26 It is a further purpose of the invention to provide a device of the above mentioned character in which the arch is provided with passages or ducts extending therethroug'h so that any gases distilled off from the fuel in 80 the hopper may pass from the hopper into the combustion chamber and so that air admitted through the front wall of the furnace may also pass through said ducts mingling with the gases distilled from the fuel to aid in the combustion thereof. The hopper will act as a coking chamber due to the fact that the heat of the fire will coke the fuel in said hopper adjacent the incandescent fuel on the stoker. Some of the gases generated b the coking portion will pass under the arc and a small amount thereof may pass through the openings or ducts exten ing through the arch. I If desired, an auxiliary means may be provided for advancing the fuel into the combustion chamber, said means being preferably in the form of a pusher member or members provided in the fire door opening in the front wall of the furnace, thus locating the same ad'acent the bottom of the hopper formed by e forward end of the sto er. In the arrangements shown and described the stoker acts not only as a stoker grate, but also as a means for conveying fuel from the hopper into the combustion chamber. Thus the fuel feeding operation from the hopper into the combustion zone of the furnace is carried on simultaneousl with the advancing of the fuel toward t e dispharge end 0 the stoker by a single operaion.

The forward face of the arch is preferably inclined so that the hopper widens toward the bottom thereof, to facilitate the feeding of the fuel therefrom.

Other objects and advanta es of the invention Wlll appear as the escription of the accompanying drawings proceeds. How- 1 ever, I desire to have it dlstinctl understood that I do not intend to limit In self to the exact details shown or descri but that I intend to include as part of myinvention all such obvious changes and modifications of arts as would occur to a. person skilled in t is art and as would fall within the scope of the claims. 4

In the drawings: I

Fig. 1 is a Ion 'tudinal sectional view of a. portion of a urnace and the adjoinin portions of a boiler embodying my improv' construction Fig.2 is a fr entary sectionalview of a modification owing an auxiliary fuel feeding member cooperating with the stoker; Fi 3 is a fragmentary lon 'tudinal sec tions view of a portion of the urnace showing removable grate-like members for closin the usual fire door opening;

I ig; 4 is an inside fragmentary elevational view of the grate-like members.

Referrin in detail to the drawings, in Fig. 1 is s own a furnace having a front wall 20, side walls, a bridge wall 23 and an ash pit 24, the to and. rear of said furnace being completed y means of the fire box boiler 25 having: crown sheet at 26 form-] fire box. Mountedwithin ing the top of t said furnace is the stoksr grate 27, the form shown beingsubetantially that shown in my .Patent No; 1,355,095 in which the individua1 members or grate bars cooperate to advance the fuel from the upper to the lower end thereof. At the lower or dischar s end of the sinker 27 is provided an ash umping section 28 and a fuel retaining'member 29 which are operated by means of the operating bar 30 provided with a handle 31, the stoker being operated by means of the bandle 32 which is connected with the stoker.

means of a bar or link 33.

grate 27 b -within the furnace is the arch Mounts 34 which extends from the crown sheet 26 which is mounted upon a pair of water tubes.

downwardly toward the stoker grate 27, but

is spaced therefrom as will be clear from Fig. 1. The arch shown in Figs. 1 and 2 is preferably a built-up brick arch which is sprung or arched at the bottom. 1

The furnace is provided with a fuel feeding door 43, which may have means therein for admitting air into the furnace. A lower door 60 is also provided which may be provided with means for regulating the passage of air through the opening 61 in the front 20.

Mounted within the furnace is the arch 62 63 and which is preferably made of tile, being provided with a section comprising a horizontally extending portion 64, a forwardly extending downturned lip portion 65, avertically extending back portion 66, and a thickened lower end portion 67 having an.

inclined wall portion 68 to thus define a passage having a horizontally extending portion 69 connected with the vertically extending portion 70 and having a reduced discharge opening 71. Said arch 62 divides the furnace into a hop er 36 and a combustion chamber 46 as previousl described, the fuel 47 being fed from the opper 36 by means of the stoker grate'27, while the operating handle 32 thereof is oscillating, due to the fact that certain of the stoker bars 48 are located at the bottom of the hopper and move the fuel underneath the arch 62 and 'into the combustion zone on said stoker the incandescent fuel whereby any combustible gases discharged through the opening will be burned immediately after leaving thehducts or passageways provided in the arc In the arrangement shown in Fig. 2, the same form of arch is used as shown in Fig. 1 and the same numerals are applied to the various parts thereof. The same form of stoker grate is also shown which is operated in the same manner as previously described. However, the arch is shown as being applied to a furnace under a horizontal tubular boiler 50 and the usual fire brick front wall 20 is provided which has the usual fire door opening 37 therein and is provided with the additional fuel feeding opening 42. However, instead of closing the usual fire door opening 37 by means of loose bricks, a plurality of pusher blocks 77 are provided which may be used to substantially close the opening, said pusher blocks being provided with transverse bars 78 between which the air spaces 79 exist so that a small amount of air may enter through the same. Said pushor blocks preferably have pivotally connected thereto links 80 which are pivoted to the levers 81 which are in turn pivoted to the front of the furnace by means of the brackets 82 and which are operated by means of the handle 83. The upper or fuel feeding opening 42 is provided with a door 43 that is of the same construction as shown in Fig. 1. In this arrangement, the pusher blocks 77 act as supplemental or auxiliary fuel feeding means which may be used for pushing the fuel 47 under the arch 62 in addition to the feeding that is obtained by means of the tilting of the stoker bars 48 provided on the stoker 27. It will be obvious that as the handle 83 is moved toward the furnace front, a block 77 will be moved toward the arch 62 and will push the fuel toward the arch and downwardly on the stoker into the combustion chamber 46, the hopper 36 serving the same purpose and being formed in the same manner between the arch; 62 and the front wall 20 as previously described.

Instead of providing pusher blocks, stationary grate-like closure members may be provided for the opening 37 as shown in Figs. 3 and 4. Said members may be made in substantially the same manner as the members 77 shown in Fig. 2 comprising the bottom flanges 84, thevertically extending ribs 85 and the laterally extending closely spaced ribs or grate-like members 7 8 between which the air spaces 7 9' 'are provided.-

Any desired number of the members 7 7 may be provided in the opening 37 in order to close the same. In Fig. 4, two of said membors are shown side by side. The members 7 7 are provided with openings 86 in the ribs 85, said ribs extending rearwardly as shown clearly in Fig. 3 so that a hook or bar may be inserted in the openings 86 to pull out the members 7 7 shouldit be desired to have I access to the lower part of the hopper or to feed fuel through the lower or usual fire door openings.

Having thus described my invention what I desire to claim and secure by United States Letters Patent is:

' 1. In a device of the character described a furnace having a stoker therein extending from one wall of said furnace toward the opposite wall thereof and a wall in said furnace spaced from said first mentioned wall to provide a hopper therebetween, said stoker passing under said last wall, said last wall forming the forward wall of the combustion chamber of the furnace and said stoker conveying fuel from said hopper into said combustion chamber, said first mentioned wall having a fuel feeding opening therein and said last wall having ducts therein extend- 1ng from the upper portion of said hopper rearwardly and downwardly to the lower liigrward portion of said combustion cham- 2. In a device of the character described a furnace having a stoker therein extending from one wall of said furnace toward the opposite wall thereof, a wall in said furnace spaced from said first mentioned wall to provide a hopper therebetween, said Stoker assing under said last wall, said last wall orming the forward wall of the combustion chamber of the furnace and said stoker conveying fuel from said hopper into said combustion chamber, auxiliary means for conveying fuel from said hopper into said combustion chamber and means for conducting gases from above the fuel in said hopper rearwardly and downwardly through said last wall into said combustion chamber.

3. In adevice of the character described a furnace having a Stoker therein extending from one wall of said furnace toward the opposite wall thereof and a wall in said furnace spaced from said first mentioned wall to provide a hopper therebetween, said stoker passing under said last wall, said last wall forming the forward wall of the combustion chamber at the furnace and said stoker conveying fuel from said hopper into said combustion chamber, said hopper increasing in size toward the bottom thereof, said arch having ducts therein leading from the upper portion of said hopperv into the lower forward portion of the combustion chamber.

In witness whereof, I hereunto subscribe my name this 15th day of May, A. D. 1925.

GEORGE A. KOHOUT. 

